Depression Anxiety Stress Scales – Long Form (DASS-42)

Abstract

The Depression Anxiety Stress Scales – Long Form (DASS-42) is a widely utilized 42-item psychological scale designed as a self-report instrument to quantitatively measure the severity of three distinct negative emotional states: depression, anxiety, and stress. In clinical practice, the primary function of the DASS-42 is to clarify the specific locus of emotional disturbance, thereby facilitating a more precise clinical assessment. It is highly valued by both researchers and clinicians due to its demonstrated high internal consistency, allowing for meaningful measurement of current emotional state or tracking changes in state over the course of therapeutic intervention.

Keywords

DASS-42, Depression Anxiety Stress Scales, self-report scale, clinical assessment, psychological measurement, depression, anxiety, stress, psychopathology, dimensional conception.

Authors

Lovibond, S.H., Lovibond, P.F.

Purpose

The core purpose of the DASS-42 is to provide a reliable and valid assessment of the severity of core symptoms associated with depression, anxiety, and stress in both clinical and non-clinical populations. The scale is specifically designed to differentiate between these three closely related, yet distinct, negative emotional syndromes, which often co-occur in clinical settings.

Beyond initial diagnosis, the DASS-42 serves as an essential tool for outcome measurement in research and treatment. By providing quantified scores for each subscale, researchers can effectively track changes in symptom severity over time, such as during the implementation of pharmacological or psychological treatments. This ability to measure change state makes it highly applicable for longitudinal studies and clinical audits.

Construct

The DASS-42 is founded on a dimensional conception of psychological disorder, positing that differences between normal emotional experience and clinically significant disturbance are primarily differences of degree, rather than categorical differences. The scale measures three separate, but correlated, constructs:

• Depression Scale: Measures symptoms related to low positive affect, including low mood, lack of enjoyment, dejection, hopelessness, and lack of initiative.

• Anxiety Scale: Focuses on physiological hyperarousal, situational anxiety, and subjective experience of panic, including symptoms like trembling, dryness of the mouth, and awareness of heart action.

• Stress Scale: Assesses symptoms of non-specific tension, difficulty relaxing, irritability, impatience, and being easily upset or agitated.

This dimensional approach means that the scores do not directly map onto discrete diagnostic categories (e.g., those postulated by the DSM or ICD), but instead quantify the level of distress experienced across these three axes.

Validity

The validity of the DASS-42 has been established through extensive norming and comparison against clinical groups. Initial development utilized a large sample of 950 first-year university students, with 504 sets of results used in the foundational trials. The instrument was subsequently normed on a comprehensive community sample of 2914 participants (1044 males, 1870 females) spanning a wide age range (17 to 69 years).

Concurrent validity was tested by comparing scores against various outpatient groups diagnosed with specific conditions, including anxiety disorders, depressive disorders, insomnia, and patients recovering from myocardial infarction. These comparisons confirmed the scale’s ability to meaningfully discriminate between clinical and non-clinical populations and to differentiate between the three emotional states it purports to measure. Although the normative sample began at age 17, the clarity of the language has led to its successful use for comparison in younger populations, sometimes down to 12 years of age, without compelling evidence against its application.

Reliability

The DASS-42 demonstrates high internal consistency across all three subscales within the normative sample, as measured by Cronbach’s alpha coefficients. The reliability scores achieved are robust:

• Depression Scale: 0.91

• Anxiety Scale: 0.84

• Stress Scale: 0.90

Both the Depression and Stress scales meet the rigorous threshold of 0.9 typically required for research applications. While the Anxiety scale’s alpha (0.84) is slightly lower, it comfortably exceeds the 0.7 threshold considered acceptable for clinical applications. The means and standard deviations (M and SD) observed in the normative sample were: Depression (M=6.34, SD=6.97), Anxiety (M=4.7, SD=4.91), and Stress (M=10.11, SD=7.91). While minor variations in mean scores were noted across gender and age groups, the established threshold scores for severity classifications remain consistent regardless of these demographic differences.

Factor Analysis

The DASS-42 is structurally supported by a three-factor model that aligns with the theoretical distinction between depression, anxiety, and stress. Factor analytic studies consistently confirm that the 42 items load strongly onto three distinct, yet correlated, factors corresponding to the three subscales. This robust factor structure supports the use of the DASS-42 not merely as a measure of general distress, but as a tool capable of isolating specific emotional components. This clear factorial differentiation is critical to the scale’s clinical utility in clarifying the locus of emotional disturbance.

Instrument

Test Type: Self-report psychological scale

Format: 42 items (Long Form) scored on a 4-point Likert scale (0 to 3)

Language Available: Originally developed in English, numerous validated translations exist globally.

Population Group: Clinical and non-clinical adults and adolescents.

Age Group: 17 to 69 years (normative sample); applicable down to age 12.

Population Details: Normed on a community sample including university students, nurses in training, and varied white-collar and blue-collar employees.

Test Methodology: Respondents rate how much each statement applied to them over the past week, using scores from 0 (“Did not apply to me at all”) to 3 (“Applied to me very much, or most of the time”). Raw scores are calculated for each of the three subscales (Depression, Anxiety, Stress) and compared against normative data, yielding percentile ranks and severity classifications (Normal, Moderate, Severe, Extremely Severe).

Keywords

Lovibond, self-assessment, negative affect, emotional disturbance, psychometric reliability, clinical screening, community sample, severity classification, three-factor model.

Authors

Author ORCID Identifier: Not specified in the source content.

Affiliation Email addresses: Not specified in the source content.

Correspondence Address: The Psychology Foundation, Room 1005 Mathews Building, University of New South Wales, NSW 2052, Australia.

Permissions & Fee and Test Year

The scale was formally published in 1995 (2nd edition of the manual). The DASS-42 is generally available for non-commercial research and clinical use free of charge, though the comprehensive manual, which provides full interpretive guidelines and cutoff scores, must be purchased. The source states that the DASS Manual can be ordered for full interpretive information. Ordering information can be found here: http://www2.psy.unsw.edu.au/groups/dass/order.htm.

Reference’s

Lovibond, S.H.; Lovibond, P.F. (1995). Manual for the Depression Anxiety Stress Scales (2nd ed.). Sydney: Psychology Foundation. The original PDF can be downloaded here: [No PDF link was provided in the source content, only the manual order link].

Items of the Depression Anxiety Stress Scales – Long Form (DASS-42)

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.